Installation and all commands are based on Ubuntu 24.04.
installation
Linux environment
sudo apt update
sudo apt install netcat
Windows environment (11)
https://nmap.org/ncat/
Ncat - Netcat for the 21st Century
Download Reference Guide Book Docs Zenmap GUI In the Movies . . \`-”’”-’/ } 6 6 { ==. Y ,== /^^^\ . / \ ) ( )-( )/ _ -""---""--- / / Ncat \_/ ( ____ \_.=|____E Ncat is a feature-packed networking utility which reads and writes data across networks from the
nmap.org
Download the installation file from the above site and install.
Command used
#Linux
nc {host} {port}
In the problem description in CTF:
nc 123.456.789 1234
If it is written like this, you can connect to nc and solve it.